If you click on the drawing above the ZIP code, the original drawing will pop up..
If you click on the characters and numbers displayed in brackets like e.g. (A11), you see the miniaturised drawing engraved on the plaque.
If you click on the little blue item, you see the whole plaque. On the bottom you find the characters and on the left or right side the numbers leading to the position of the drawing.
Click on any field on the plaque and the engraved drawing is shown.